CN1539057A - Atmospheric pressure detection device and method of four-stroke engine - Google Patents

Atmospheric pressure detection device and method of four-stroke engine Download PDF

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CN1539057A
CN1539057A CNA028155769A CN02815576A CN1539057A CN 1539057 A CN1539057 A CN 1539057A CN A028155769 A CNA028155769 A CN A028155769A CN 02815576 A CN02815576 A CN 02815576A CN 1539057 A CN1539057 A CN 1539057A
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pressure
fuel
mentioned
inspiration
stroke engine
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CN100419241C (en
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�G���Һ�
沢田雄一郎
̩
高桥通泰
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Yamaha Motor Co Ltd
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Yamaha Motor Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/703—Atmospheric pressure
    • F02D2200/704—Estimation of atmospheric pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/14—Timing of measurement, e.g. synchronisation of measurements to the engine cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The atmospheric pressure is detected accurately without using an atmospheric pressure sensor. The atmospheric pressure is obtained from an intake air pressure just before an inlet valve opens by detecting an intake air pressure. Since the intake air pressure just before the inlet valve opens becomes unstable when the engine load is large, the atmospheric pressure is calculated from an intake air pressure just before the inlet valve opens when the engine load is small. In addition, since the intake air pressure just before the inlet valve opens depending upon engine rotational speeds, the atmospheric pressure is calculated from an intake air pressure just before the inlet valve opens when the engine rotational speed resides in a predetermined rotational speed area.

Description

The barometric pressure detection device and the method for four stroke engine
Technical field
The present invention relates to atmospheric barometric pressure detection device of a kind of detection and method, be applicable to the control of the four stroke engine of the fuel injection system that for example has burner oil.
Background technique
In recent years, along with popularizing of the fuel injection system that is known as sparger, the opportunity of burner oil and amount of fuel injected, be that the control that air fuel ratio (air fuel ratio) waits becomes easily, can promote cleaning of height outputization, low fuel-fee, exhaust etc.Wherein,, generally to detect the state of Aspirating valves closely, promptly detect the phase state of camshaft, match and burner oil with it particularly about the opportunity of burner oil.But, be used to detect the so-called cam sensor price height of the phase state of camshaft, particularly in sulky vehicle etc., problems such as cylinder head maximization are arranged, in most cases can not adopt.Therefore, for example open in the flat 10-227252 communique the spy, proposed to detect bent axle phase state and pressure of inspiration(Pi), detect the engine controlling unit of the stroke state of cylinder according to their.Thereby, by using the prior art, do not detect the phase place of camshaft, just can detect stroke state, so match, can control injection opportunity of fuel etc. with its stroke state.
But,, supply in the fuel injection system after must the fuel in the fuel tank being pressurizeed with pump for from above-mentioned such fuel injection system burner oil.Such as everyone knows, owing to change,, use the pressure regulator valve that is known as regulator in order to limit its CLV ceiling limit value by the pressure of the fuel after the pump pressurization.In sulky vehicle, this regulator operated by rotary motion is near fuel injection system, usually will be by fuel injection system the environment, the pressure in for example sucking pipe of burner oil as back pressure, constitute usually, utilize spring and the regulator control of the regulation set is risen after being pressed in this.Thereby the injected fuel pressure that is made of the pressure that supplies to the fuel in the fuel injection system and the pressure reduction of the environment of burner oil equates with the regulator control pressure of regulator usually.
But, if in this wise regulator is arranged on fuel injection system near, then in each fuel injection system, all need to send back to pipe arrangement, the described pipe arrangement of sending back to will be sent back in the fuel tank by the fuel of regulator restriction.In addition, usually, in most cases regulator is identical with the manufacturer of pump, but under the situation that pump and regulator are provided with respectively, they are just paid respectively, and component number is many and can not utilize centralization to realize that cost reduces.Therefore, for example can consider pump and regulator centralization etc., with regulator configuration at pump side.Like this, not only do not need to send back to the pipe arrangement of sending back to of fuel, and can realize the minimizing of component number and the reduction of cost.
But, if in this wise with regulator configuration at pump side, then because the back pressure of regulator becomes barometric pressure, so supply to the pressure of the fuel in the fuel injection system roughly certain (with variations such as height above sea level, then fuel pressure also changes as if barometric pressure).On the other hand, particularly as sulky vehicle, not having in sucking pipe under the situation of knock out drum (サ one ジ Application Network), the pressure in the sucking pipe of burner oil, is that fuel sprays external pressure and changes easily.That is, the injected fuel pressure that is made of the pressure reduction of the pressure of the environment of pressure that supplies to the fuel in the fuel injection system and burner oil becomes unstable.In this wise, if the injected fuel pressure instability, then the fuel flow rate from each unit time that fuel injection system sprays becomes unstable, just can not be only in fuel injection time control example as the fuel injection amount of the air fuel ratio that is used to reach expectation.Therefore, in order to compensate the control fuel injection amount, for example special engine controlling unit of putting down in writing in the flat 8-326581 communique of opening is arranged based on such injected fuel pressure.In this engine controlling unit, detect injected fuel pressure, it is carried out obtaining area behind the stipulated time integration, this area and area as benchmark are compared compensation control fuel injection amount.
At this, because injected fuel pressure is the pressure reduction of pressure that supplies to the environment of the pressure of the fuel in the fuel injection system and burner oil, therefore, when for example the pressure of the fuel in supplying to fuel injection system is for the pressure that limited by regulator, this pressure is the addition value that barometric pressure and regulator control are pressed, if barometric pressure is incorrect, the pressure that then supplies to the fuel in the fuel injection system is also incorrect.Therefore, consider with the atmospheric atmosphere pressure sensor of detection, but, be restricted so particularly in sulky vehicle, use owing to atmosphere pressure sensor high price and large-scale.In addition, for example after detection flow into the volume flowrate of the air in the motor, determine in the engine controlling unit of fuel injection amount, for make-up air density, also must carry out atmospheric detection, expect to have the barometric pressure detection device and the method that replace atmosphere pressure sensor.
The present invention develops in order to solve above-mentioned each problem, its purpose is to provide a kind of barometric pressure detection device and method of four stroke engine, the atmospheric while can be correctly do not detected not using atmosphere pressure sensor, the minimizing of component number and the reduction of cost can be realized.
Disclosure of an invention
In order to solve above-mentioned each problem, the barometric pressure detection device that the described barometric pressure detection device of claim 1 among the present invention is a four stroke engine, this four stroke engine has: the regulator of atmosphere opening type, be installed on the pump that the fuel in the fuel tank is pressurizeed the upper limit of pressure value of the fuel after restriction is pressurizeed by said pump; Fuel injection system will be ejected in the air suction way of four stroke engine by the fuel that above-mentioned regulator has limited CLV ceiling limit value; Suction control valve is arranged on the above-mentioned air suction way, it is characterized in that, possessing has: the pressure of inspiration(Pi) detection part, detect the pressure of inspiration(Pi) in the downstream of above-mentioned suction control valve; The operating condition detection part, the operating condition of detection four stroke engine; The barometric pressure detection part, based on by the operating condition of the detected four stroke engine of above-mentioned operating condition detection part with by the detected pressure of inspiration(Pi) of pressure of inspiration(Pi) detection part, pressure of inspiration(Pi) before little and Aspirating valves is opened according to the load of four stroke engine detects barometric pressure.
In addition, the barometric pressure detection device of the described four stroke engine of the claim 2 among the present invention, it is characterized in that, in the invention of aforesaid right requirement 1, when above-mentioned barometric pressure detection part is in the engine revolution number zone of predefined regulation in the operating condition by the detected motor of above-mentioned operating condition detection part, open pressure of inspiration(Pi) before according to above-mentioned Aspirating valves, detect barometric pressure.
In addition, the barometric pressure detecting method of the described four stroke engine of the claim 3 among the present invention is the barometric pressure detecting method of four stroke engine, this four stroke engine has: the regulator of atmosphere opening type, be installed on the pump that the fuel in the fuel tank is pressurizeed the upper limit of pressure value of the fuel after restriction is pressurizeed by said pump; Fuel injection system will be ejected in the air suction way of four stroke engine by the fuel that above-mentioned regulator has limited CLV ceiling limit value; Suction control valve, be arranged on the above-mentioned air suction way, it is characterized in that, in the pressure of inspiration(Pi) in the downstream of detecting above-mentioned suction control valve, detect the operating condition of four stroke engine, based on the operating condition and the pressure of inspiration(Pi) of detected four stroke engine, the pressure of inspiration(Pi) before little and Aspirating valves is opened according to the load of four stroke engine detects barometric pressure.
In addition, the barometric pressure detecting method of the described four stroke engine of the claim 3 among the present invention, it is characterized in that, in the invention of aforesaid right requirement 3, when the operating condition of above-mentioned detected motor is in the engine revolution number zone of predefined regulation, open pressure of inspiration(Pi) before according to above-mentioned Aspirating valves, detect barometric pressure.
The simple declaration of accompanying drawing
Fig. 1 is the motor used of motor cycle and the summary construction diagram of control gear thereof.
Fig. 2 is the block diagram that a mode of execution of engine controlling unit of the present invention is shown.
Fig. 3 is the explanatory drawing according to the phase place of bent axle and pressure of inspiration(Pi) detection stroke state.
Fig. 4 is the map that is used for the interior air quality calculating of cylinder of the air quality calculating portion in the cylinder that is stored in.
Fig. 5 is used for being stored in the map that the target air-fuel ratio of target air-fuel ratio calculating part is calculated.
Fig. 6 is the Action Specification figure of transitional period compensation section.
Fig. 7 be degree in crank angle is shown, be the explanatory drawing of the relation of stroke and pressure of inspiration(Pi).
Fig. 8 be at each engine revolution number degree in crank angle is shown, be the explanatory drawing of the relation of stroke and pressure of inspiration(Pi).
Fig. 9 is the explanatory drawing that the relation of pressure of inspiration(Pi) before engine loading and the suction stroke is shown.
Figure 10 be fuel pressure is shown, as the explanatory drawing of the relation of the pressure of inspiration(Pi) of external pressure, injected fuel pressure.
Figure 11 is the explanatory drawing that the barometric pressure that calculates from pressure of inspiration(Pi) and actual atmospheric relation are shown.
The best mode that carries out an invention
Below, describe about embodiments of the present invention.
Fig. 1 is the schematic configuration that an example of motor that motor cycle for example uses and control gear thereof is shown.This motor 1 is four cylinder four stroke engine, has cylinder block 2, bent axle 3, piston 4, firing chamber 5, sucking pipe (air suction way) 6, Aspirating valves 7, outlet pipe 8, outlet valve 9, ignition spark plug 10, spark coil 11.In addition, in sucking pipe 6, be provided with the throttle valve (air-breathing control handle) 12 that carries out switch corresponding to throttle opening, the sparger 13 of the injection apparatus that acts as a fuel is being set on the sucking pipe (air suction way) 6 of the upstream side of this throttle valve 12.This sparger 13 is connected with filter 18, petrolift 17, regulator 16 in being arranged on fuel tank 19.Have, above-mentioned regulator 16 is the regulators that limit the CLV ceiling limit value of the fuel pressure of utilizing petrolift 17 again, is arranged in this wise under the situation in the fuel tank 19, sets for: as back pressure, predefined thus regulator control presses liter with barometric pressure.Thereby about being lower than pump that the control of this regulator presses pressures that spue, this pump pressure that spues supplies to fuel pressure in the sparger 13 (correctly with barometric pressure as the pump of the back pressure pressure that spues) for former state.In addition, this motor 1 is so-called independent suction system, and above-mentioned sparger 13 is arranged on each sucking pipe 6 of each cylinder.
Running state by control unit of engine 15 these motors 1 of control.Then, as the control input that detects this control unit of engine 15, be the device of the running state of motor 1, be provided with: be used to detect bent axle 3 angle of swing, be the crank angle sensor 20 of phase place; Detect cylinder block 2 temperature or cooling water temperature, be the cooling-water temperature sensor 21 of the temperature of motor self; Detect the exhaust air-fuel ratio sensor 22 of the air fuel ratio in the outlet pipe 8; Be used for fuel with above-mentioned petrolift 17 fuel pressure sensor 23 that pressure detects as the fueling pressure of supplying with sparger 13 that spues; Be used to detect the inspiratory pressure sensor 24 of the pressure of inspiration(Pi) in the sucking pipe 6; Detect temperature in the sucking pipe 6, be the inhalation temperature sensor 25 of inhalation temperature.And the testing signal of above-mentioned control unit of engine 15 these sensors of input, to above-mentioned petrolift 17, sparger 13, spark coil 11 output control signals.
Above-mentioned control unit of engine 15 is made of not shown microcomputer etc.Fig. 2 is the block diagram that the mode of execution of the engine control calculation process of being undertaken by the microcomputer in this control unit of engine 15 is shown.In this calculation process, be made of following part: engine revolution is counted calculating part 26, according to above-mentioned degree in crank angle calculated signals engine revolution number: crank is ( ィ ミ Application グ) detection unit 27 regularly, according to degree in crank angle signal and above-mentioned pressure of inspiration(Pi) signal, detect the crank timing information, be the stroke state equally; Air quality calculating portion 28 in the cylinder, read in by these crank timing detection unit 27 detected crank timing informations, according to above-mentioned inhalation temperature signal, above-mentioned cooling water temperature signal, above-mentioned pressure of inspiration(Pi) signal and count the engine revolution number that calculating part 26 calculates, calculate air quality (suction air quantity) in the cylinder by above-mentioned engine revolution; Target air-fuel ratio calculating part 33 based on counted engine revolution number and the above-mentioned pressure of inspiration(Pi) signal that calculating part 26 calculates by above-mentioned engine revolution, calculates target air-fuel ratio; Fuel injection amount calculating part 34, air quality in the cylinder that calculates based on the target air-fuel ratio that calculates by this target air-fuel ratio calculating part 33, above-mentioned pressure of inspiration(Pi) signal with by air quality calculating portion 28 in the said cylinder, computing fuel emitted dose; Barometric pressure according to above-mentioned pressure of inspiration(Pi) signal with by above-mentioned crank timing detection unit 27 detected crank timing informations, calculates in barometric pressure calculating portion 41; Injected fuel pressure calculating part 42 according to the barometric pressure that is calculated by this barometric pressure calculating portion 41 with by the fueling pressure and the above-mentioned pressure of inspiration(Pi) signal of above-mentioned fuel pressure sensor 23 detected supply spargers 13, calculates injected fuel pressure; Fuel injection systems is counted calculating part 43, according to the injected fuel pressure that is calculated by this fueling injection pressure calculating part 42, computing fuel jet coefficient; Fuel injection time calculating part 44 is counted the fuel injection systems number that calculating part 43 calculates, computing fuel discharge time based on the fuel injection amount that is calculated by above-mentioned fuel injection amount calculating part 34 with by fuel injection systems; Injection pulse carry-out part 30 is according to the fuel injection time that is calculated by above-mentioned fuel injection time calculating part 44 with by above-mentioned crank timing detection unit 27 detected crank timing informations, to above-mentioned sparger 13 output injection pulses; Ignition timing calculating part 31 according to counted engine revolution number that calculating part 26 calculates and the target air-fuel ratio of being set by above-mentioned target air-fuel ratio calculating part 33 by above-mentioned engine revolution, calculates ignition timing; Firing pulse carry-out part 32 reads in by above-mentioned crank timing detection unit 27 detected crank timing informations, to the firing pulse of above-mentioned spark coil 11 outputs corresponding to the ignition timing of being set by above-mentioned ignition timing calculating part 31.
Above-mentioned engine revolution is counted the time rate of change of calculating part 26 according to above-mentioned degree in crank angle signal, and calculating is as the rotational speed of the bent axle of the output shaft of motor, as the engine revolution number.
Above-mentioned crank timing detection unit 27 has with above-mentioned spy opens the same structure of putting down in writing in the flat 10-227252 communique of stoke distinguishing device, for example shown in Figure 3 like this, detects the stroke state of each cylinder, will export as the crank timing information.That is, in four-circulation motor since bent axle and camshaft always in accordance with regulations phase difference rotate continuously, so for example shown in Figure 3, when having read in crank pulse, the crank pulse that illustrates " 4 " is some in exhaust stroke or the compression stroke.Such as everyone knows, in exhaust stroke, because exhaust valve closure, Aspirating valves cuts out, so pressure of inspiration(Pi) increases, at the initial stage of compression stroke, because Aspirating valves is also being opened, thus the pressure of inspiration(Pi) reduction, perhaps, even Aspirating valves is cutting out, and pressure of inspiration(Pi) has also reduced in the suction stroke of going ahead of the rest.Thereby the crank pulse of the diagram " 4 " when pressure of inspiration(Pi) is low shows second cylinder and is in compression stroke, becomes the air-breathing lower dead centre of second cylinder when having obtained the crank pulse of diagram " 3 ".In this wise, can detect the stroke state of certain cylinder, because each cylinder phase difference in accordance with regulations is rotated, so for example the crank pulse as the following diagram " 9 " of the crank pulse of the diagram " 3 " of the air-breathing lower dead centre of above-mentioned second cylinder is exactly the air-breathing lower dead centre of first cylinder, the crank pulse of the diagram of its back " 3 " is the air-breathing lower dead centre of the 3rd cylinder, and the crank pulse of the diagram of its back " 9 " is the air-breathing lower dead centre of the 4th cylinder.And, just can detect present stroke state in more detail if between the rotational speed interpolation the trip with bent axle.
Air quality calculating portion 28 has and is used for counting the three-dimensional map that engine revolution number that calculating part 26 calculates calculates air quality in the cylinder according to above-mentioned pressure of inspiration(Pi) signal with by above-mentioned engine revolution as shown in Figure 4 in the said cylinder.In this cylinder the three-dimensional map of air quality for example in fact only in the cylinder of instrumentation when making motor rotation number rotation in accordance with regulations, when pressure of inspiration(Pi) is changed air quality get final product, can come instrumentation by fairly simple experiment, thereby the generation of reflection is easier to.In addition, if the simulation of engine test of height is arranged, also can generate reflection with it.Have again,, therefore, also can compensate with above-mentioned cooling water temperature (engine temperature) signal owing to the temperature of air quality in the cylinder according to motor changes.
Above-mentioned target air-fuel ratio calculating part 33 has and is used for counting the engine revolution number that calculating part 26 calculates according to above-mentioned pressure of inspiration(Pi) signal with by above-mentioned engine revolution as shown in Figure 5, calculates the three-dimensional map of target air-fuel ratio.This three-dimensional map also can be set in theory to a certain extent.Air fuel ratio is general relevant with moment of torsion, if air fuel ratio is little, be the many and little air of fuel, then moment of torsion just increases, and efficient is with regard to reduction on the other hand.Otherwise if air fuel ratio is big, be that fuel is few and air is many, then moment of torsion just reduces, but efficient just improves.The state that air fuel ratio is little is called dense thick, and the state that air fuel ratio is big is called thin, the thinnest state and is called as so-called ideal air-fuel ratio or chemically correct fuel, is the air fuel ratio of gasoline perfect combustion, promptly is 14.7.
The engine revolution number is the operating condition of motor, usually, increases air fuel ratio in high rotary side, reduces air fuel ratio in low rotary side.This is in order to improve the responsiveness of moment of torsion in low rotary side, to improve the responsiveness of rotation status in high rotary side.In addition, pressure of inspiration(Pi) is the engine loading state of throttle valve opening etc., usually, the big state of engine loading, be throttle valve opening big, when pressure of inspiration(Pi) is also big, reduce air fuel ratio, at the little state of engine loading, be that throttle valve opening is little, pressure of inspiration(Pi) also hour, increase air fuel ratio.This is in order to pay attention to moment of torsion when engine loading is big, in engine loading hour attention efficient.
Like this, target air-fuel ratio is to grasp the numerical value of physical significance easily, thereby, just can cooperate the output characteristics of the motor of requirement, to a certain extent the target setting air fuel ratio.Certainly, also can cooperate the engine output characteristics of actual vehicle to adjust.
In addition, this target air-fuel ratio calculating part 33 has transitional period compensation section 29, and this transitional period compensation section 29 is according to above-mentioned pressure of inspiration(Pi) signal, the transitional period of the operating condition of detection of engine, detect acceleration mode and deceleration regime particularly, the compensation target air-fuel ratio matches with it.For example shown in Figure 6, because pressure of inspiration(Pi) also is the result of throttle valve operation, so as can be known when pressure of inspiration(Pi) becomes big, open the acceleration mode that requires acceleration behind the throttle valve exactly.After having detected such acceleration mode, correspondingly, temporarily set for example above-mentioned target air-fuel ratio, afterwards, turn back to original target air-fuel ratio in dense thick side.Return the method for target air-fuel ratio and can utilize existent method, the average weighted Weighting factor of the air fuel ratio that is set in dense thick side in the transitional period and original target air-fuel ratio is gradually changed etc.Otherwise, also can after having detected deceleration regime, be set at, and pay attention to efficient than original target air-fuel ratio lean side.
On the other hand, in above-mentioned barometric pressure calculating portion 41, calculate barometric pressure according to above-mentioned pressure of inspiration(Pi) signal and crank timing information.Fig. 7 is the phase place that cooperates bent axle, be crank timing information and represented the figure of pressure of inspiration(Pi), the engine loading of each curve during corresponding to degree in crank angle (180 °), for example showing, 45kPa is the minimum engine load, 100kPa maximum engine load (as mentioned above, pressure of inspiration(Pi) changes corresponding to throttle valve opening).In the figure, after degree in crank angle (360 °), begin suction stroke.And before this suction stroke, promptly near degree in crank angle (360 °), pressure of inspiration(Pi) is roughly stable, and it is worth as described later, is substantially equal to barometric pressure.This be because, in not having the motor of pressurized machine, when so-called pressure of inspiration(Pi) stablize, promptly be atmospheric degree, thereby, in the present embodiment, detect before this suction stroke, be that Aspirating valves leaves pressure of inspiration(Pi) before and as barometric pressure.But from this figure as can be known, because when engine loading is big, pressure of inspiration(Pi) is a little a bit unstable, therefore, uses the pressure of inspiration(Pi) when being in little regional of engine loading to detect barometric pressure.
Fig. 8 illustrates the state of changing that has changed the pressure of inspiration(Pi) when engine revolution is counted.From this figure as can be known, even in identical engine loading, according to the engine revolution number, the pressure of inspiration(Pi) before Aspirating valves leaves becomes unstable.Fig. 9 is based on these results, pressure of inspiration(Pi), engine loading when getting above-mentioned degree in crank angle (180 °) are transverse axis, get similarly that pressure of inspiration(Pi) is the longitudinal axis before the suction stroke, the engine revolution number as parameter, is shown the relation of pressure of inspiration(Pi) and engine loading before this suction stroke.Thereby, expecting under the tighter situation, also the adding of engine revolution number can be become one of parameter and detect barometric pressure, make setting Aspirating valves be left pressure of inspiration(Pi) before and count the zone as the engine revolution that barometric pressure calculates corresponding to engine loading, only when becoming this engine revolution number zone, detect barometric pressure according to the pressure of inspiration(Pi) before the suction stroke.
Above-mentioned injected fuel pressure calculating part 42 based on above-mentioned pressure of inspiration(Pi), pump spue pressure, the barometric pressure that calculates by barometric pressure calculating portion 41 etc., calculate the injected fuel pressure that the pressure reduction by the external pressure of fuel pressure and burner oil constitutes.Figure 10 illustrates fuel pressure, as the pressure of inspiration(Pi) of external pressure, the relation of injected fuel pressure.As present embodiment, be provided with in the fuel tank side under the situation of petrolift 17 and regulator 16, these pump back pressures and regulator back pressure all become barometric pressure (fuel tank be not air-tight state) completely.On this barometric pressure, spue pressure and regulator pilot pressure of pump all rises, and spues pressure during less than the regulator pilot pressure at pump, and this pump pressure that spues becomes fuel pressure, at the pump pressure that spues is regulator pilot pressure when above, and this regulator pilot pressure becomes fuel pressure.Utilize so relatively calculated fuel pressure after, deduct above-mentioned pressure of inspiration(Pi) (fuel injection external pressure) from it and calculate injected fuel pressure.Particularly under the situation of sulky vehicle, owing in sucking pipe, not having knock out drum, so as shown in the figure, the change of pressure of inspiration(Pi) increases, therefore, and as described later, in order to utilize fuel injection time to control fuel injection amount, just must correctly detect injected fuel pressure.In the present embodiment, detect barometric pressure according to pressure of inspiration(Pi) as described above, when can further spue according to pump pressure and pressure of inspiration(Pi) correctly detect injected fuel pressure, can realize the not reduction of this part cost of atmosphere pressure sensor.
Then, count in the calculating part 43,, calculate the fuel injection systems number that is used for the computing fuel discharge time according to the injected fuel pressure that calculates by above-mentioned injected fuel pressure calculating part 42 at above-mentioned fuel injection systems.At first, the density of establishing fuel is ρ, and the flow velocity that supplies to the fuel in the sparger 13 is V 1, supply to the fuel in the sparger 13 pressure, be that above-mentioned fuel pressure is P 1, the flow velocity that is ejected into the fuel in the sucking pipe from sparger 13 is V 2, the environment of the fuel that sprays from sparger 13, be that above-mentioned pressure of inspiration(Pi) is P 2The time, think the flow velocity V that supplies to the fuel in the sparger 1Be roughly " 0 ", therefore, according to the Bai Ernuli theorem, following 1 formula is set up.
P 1＝ρ·V 2 2/2+P 2 …(1)
About being ejected into the flow velocity V of the fuel in the sucking pipe 2, obtain by following 2 formulas.
V 2＝(2(P 1-P 2)/ρ) 1/2 …(2)
At this, (P1-P2) in above-mentioned 2 formulas is the injected fuel pressure that is calculated by above-mentioned injected fuel pressure calculating part 42, at this, if it is made as P, sectional area with the spray orifice of sparger 13 is made as S simultaneously, and then the quality of fuel M from each unit time that sparger 13 sprays represents with following 3 formulas.
M＝S·V 2·ρ＝S·(2ρ·P) 1/2 …(3)
So as can be known, proportional from the subduplicate value of the quality of fuel M of each unit time that sparger 13 sprays and injected fuel pressure P.
Therefore, set the injected fuel pressure P that for example becomes benchmark 0, at its benchmark injected fuel pressure P 0The time, be Q if establish the fuel injection systems number (burner oil Flow characteristics coefficient) of the fuel that sprays unit mass T0, then when injected fuel pressure is P, spray fuel injection systems number (the burner oil Flow characteristics coefficient) Q of the fuel of unit mass tProvide with following 4 formulas.
Q t＝Q t0×(P 0/P) 1/2 …(4)
Thereby, if above-mentioned fuel injection amount be multiply by this fuel injection systems number (burner oil Flow characteristics coefficient), just can the computing fuel discharge time.
Thereby, in above-mentioned fuel injection time calculating part 44, the fuel injection amount V that is calculated by above-mentioned fuel injection amount calculating part 34 be multiply by this fuel injection systems number (burner oil Flow characteristics coefficient) Q t, computing fuel discharge time T.That is, the calculation process of being undertaken by above-mentioned fuel injection time coefficient calculations portion 43 and fuel injection time calculating part 44 is will be for example as benchmark injected fuel pressure P 0The time burner oil Flow characteristics coefficient Q that obtains T0, be used to reach fuel injection amount V, the subduplicate value P of said reference injected fuel pressure value of the air fuel ratio of expectation 0 1/2Long-pending value when being made as the specified value that has preestablished, the fuel injection time T that calculates becomes the square root P with the injected fuel pressure value 1/2Except that the value behind this specified value.
Then, in injection pulse carry-out part 30, by above-mentioned crank timing detection unit 27 detected crank timing informations, the computing fuel injection beginning is in the time of period in basis, based on the fuel injection time that calculates by above-mentioned fuel injection time calculating part 44, to sparger 13 output injection pulses.
In this wise, in the present embodiment, owing to jointly regulator 16 is set in fuel tank 19 sides with petrolift 17, detection supplies to the fuel pressure in the sparger 13 and the external pressure of burner oil, be the pressure reduction of pressure of inspiration(Pi), as injected fuel pressure, just can be based on the subduplicate value of this detected injected fuel pressure, control is from the fuel injection time of sparger 13, therefore, at the integration that does not need injected fuel pressure and a large amount of reflection etc. and when can alleviate computing load, petrolift 17 and regulator 16 centralization can be realized the minimizing of component number and the reduction of cost.
Figure 11 illustrates the barometric pressure (being to infer barometric pressure among the figure) that calculated by above-mentioned barometric pressure calculating portion 41 and reality by the detected barometric pressure of atmosphere pressure sensor.Wherein, the barometric pressure flat portions that calculates shows operating condition owing to above-mentioned motor and does not become the state of regulation and fails to upgrade the atmospheric time.On the highland of height above sea level 2100m, carry out instrumentation, after the place from height above sea level drops to low place rapidly, rise to the place of height above sea level more rapidly.In this wise, on the highland that the height above sea level difference is arranged, atmospheric variation is big, thereby, do not control fuel injection amount if correctly detect barometric pressure, just can not obtain original Engine torque and output, but as can be known from figure, the barometric pressure that calculates is followed actual barometric pressure (in several % of error), if control fuel injection amount as described above, be fuel injection time with this barometric pressure that calculates, just can obtain original Engine torque and output.
Have again, in the above-described embodiment, about supplying to the fuel pressure in the sparger and be illustrated with atmospheric situation in order to calculate, but barometric pressure detection device of the present invention also goes for needing to detect atmospheric any device, also go for for example detecting the volume flowrate that flow into the air in the motor and control under the situation of fuel injection amount, in order to compensate volume flowrate and to detect atmospheric device according to air density.
In addition, in the above-described embodiment, be that so-called many cylinder types motor of 4 cylinders has been described in detail about number of cylinders, but also can similarly be applicable to single cylinder motor.
In addition, control unit of engine can replace microcomputer with various arithmetic circuits.
Industrial utilizability
As described above, atmospheric pressure detection device and method according to four-stroke engine of the present invention, owing to be to consist of like this, namely based on operating condition and the pressure of inspiration(Pi) of four-stroke engine, pressure of inspiration(Pi) before little and inlet valve is opened according to the load of four-stroke engine, detect atmospheric pressure, therefore, by the engine operating status according to so-called engine loading and engine rotation number, calculate atmospheric pressure according to the pressure of inspiration(Pi) of inlet valve before opening, thus can be without atmosphere pressure sensor, and correctly detect atmospheric pressure, like this, just can realize the minimizing of component number and the reduction of cost.
In addition, atmospheric pressure detection device and method according to four-stroke engine of the present invention, owing to be to consist of like this, namely when being in the engine rotation number zone of predefined regulation, open pressure of inspiration(Pi) before according to inlet valve, detect atmospheric pressure, therefore, can further correctly detect atmospheric pressure.

Claims (4)

1. the barometric pressure detection device of a four stroke engine, this four stroke engine has: the regulator of atmosphere opening type is installed on the pump that the fuel in the fuel tank is pressurizeed the upper limit of pressure value of the fuel of restriction after by the said pump pressurization; Fuel injection system will be ejected in the air suction way of four stroke engine by the fuel that above-mentioned regulator has limited CLV ceiling limit value; Suction control valve is arranged on the above-mentioned air suction way, it is characterized in that, possessing has: the pressure of inspiration(Pi) detection part, detect the pressure of inspiration(Pi) in the downstream of above-mentioned suction control valve; The operating condition detection part, the operating condition of detection four stroke engine; The barometric pressure detection part, based on by the operating condition of the detected four stroke engine of above-mentioned operating condition detection part with by the detected pressure of inspiration(Pi) of pressure of inspiration(Pi) detection part, pressure of inspiration(Pi) before little and Aspirating valves is opened according to the load of four stroke engine detects barometric pressure.
2. the barometric pressure detection device of four stroke engine as claimed in claim 1, it is characterized in that, when above-mentioned barometric pressure detection part is in the engine revolution number zone of predefined regulation in the operating condition by the detected motor of above-mentioned operating condition detection part, open pressure of inspiration(Pi) before according to above-mentioned Aspirating valves, detect barometric pressure.
3. the barometric pressure detecting method of a four stroke engine, this four stroke engine has: the regulator of atmosphere opening type is installed on the pump that the fuel in the fuel tank is pressurizeed the upper limit of pressure value of the fuel of restriction after by the said pump pressurization; Fuel injection system will be ejected in the air suction way of four stroke engine by the fuel that above-mentioned regulator has limited CLV ceiling limit value; Suction control valve, be arranged on the above-mentioned air suction way, it is characterized in that, in the pressure of inspiration(Pi) in the downstream of detecting above-mentioned suction control valve, detect the operating condition of four stroke engine, based on the operating condition and the pressure of inspiration(Pi) of detected four stroke engine, the pressure of inspiration(Pi) before little and Aspirating valves is opened according to the load of four stroke engine detects barometric pressure.
4. the barometric pressure detecting method of four stroke engine as claimed in claim 3, it is characterized in that, when the operating condition of above-mentioned detected motor is in the engine revolution number zone of predefined regulation, open pressure of inspiration(Pi) before according to above-mentioned Aspirating valves, detect barometric pressure.
CNB028155769A 2001-10-31 2002-10-22 Atmospheric pressure detection device and method of four-stroke engine Expired - Lifetime CN100419241C (en)

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BR0213732B1 (en) 2011-08-09
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ES2365843T3 (en) 2011-10-11
ATE514849T1 (en) 2011-07-15

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